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Hartson, a father of three, spent five seasons at Celtic from 2001, before which he played for Luton, Arsenal, West Ham, Wimbledon and Coventry. He retired last year after being released by West Bromwich Albion and has been working as a TV commentator since.

His family issued a statement on Wednesday saying that they and Harston's many friends "are continuing to support John in any way we can".

"He is receiving outstanding care from all the medical and surgical staff and we would like to thank everyone at both Singleton and Morriston, as well as the excellent ambulance staff.

"We have been overwhelmed by the support and goodwill from many thousands of football fans, players, clubs and sporting figures and we have drawn strength from this support."

The family also asked for Hartson's privacy to be respected while he continues to undergoes treatment in hospital